Annual report pursuant to Section 13 and 15(d)

PARENT COMPANY FINANCIAL INFORMATION (Financial Information for the Parent Company - Statements of Cash Flows) (Details)

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PARENT COMPANY FINANCIAL INFORMATION (Financial Information for the Parent Company - Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 72,923 $ 77,476 $ 67,079
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation of premises and equipment 11,183 10,215 10,776
Acquisition accounting amortization, net 866 (1,534) (1,823)
Issuance of common stock for services 724 533 564
Net (increase) decrease in other assets (5,785) (14,810) 2,692
Net increase in other liabilities 5,352 (1,898) (2,780)
Net cash and cash equivalents provided by operating activities 110,333 93,843 110,923
Investing activities:      
Net increase in premises and equipment (9,261) (6,339) (3,870)
Proceeds from (payments for) equity method investment 0 0 (355)
Cash received in acquisitions 5,038 207 0
Net cash and cash equivalents provided by (used in) investing activities (885,753) (715,117) (375,286)
Financing activities:      
Repayments of short-term borrowings 217,371 187,804 1,584
Repayments of long-term borrowings (10,000) (57,500) (10,000)
Proceeds from issuance of long-term borrowings 20,000 178,000 0
Cash dividends paid (35,393) (33,672) (29,082)
Vesting of restricted stock, including tax effects (1,567) (586) (416)
Net cash and cash equivalents provided by (used in) financing activities 795,556 657,851 273,763
Net increase (decrease) in cash and cash equivalents 20,136 36,577 9,400
Cash and cash equivalents at beginning of the period 179,237 142,660 133,260
Cash and cash equivalents at end of the period 199,373 179,237 142,660
Parent Company      
Operating activities:      
Net income 72,923 77,476 67,079
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed net income of subsidiaries (47,646) (31,984) (20,800)
Depreciation of premises and equipment 439 438 435
Acquisition accounting amortization, net 260 247 235
Issuance of common stock for services 724 533 564
Net (increase) decrease in other assets (4,167) (2,402) 902
Net increase in other liabilities 5,283 5,533 6,124
Net cash and cash equivalents provided by operating activities 27,816 49,841 54,539
Investing activities:      
Net increase in premises and equipment (35) (33) (35)
Proceeds from (payments for) equity method investment 72 0 (355)
Payments for investments in and advances to subsidiaries 0 (125,000) 0
Repayment of investments in and advances to subsidiaries 0 540 0
Net cash and cash equivalents provided by (used in) investing activities 37 (124,493) (390)
Financing activities:      
Repayments of short-term borrowings 0 0 (8,000)
Repayments of long-term borrowings 0 (7,500) (625)
Proceeds from issuance of long-term borrowings 0 148,000 0
Cash dividends paid (35,393) (33,672) (29,082)
Issuance (repurchase) of common stock 1,037 (31,295) (15,332)
Vesting of restricted stock, including tax effects (1,567) (586) (416)
Net cash and cash equivalents provided by (used in) financing activities (35,923) 74,947 (53,455)
Net increase (decrease) in cash and cash equivalents (8,070) 295 694
Cash and cash equivalents at beginning of the period 10,681 10,386 9,692
Cash and cash equivalents at end of the period $ 2,611 $ 10,681 $ 10,386